You are comparing apples to oranges. The names Jujitsu in 2017 is not what it was back in the Samurai if it was indeed used back then. What you get now in Jujitsu and again depending which branch is totally different training and time span.
But really do you want to use MMA for self defense? If it takes forever to get good habits and it takes triple the time to get rid of bad habits!!! Do you really want to take a chance with sports habits for a split second error that can cost you your life?